Hedge fund Viking Global Investors LP just reported its first quarter portfolio. The fund is founded by Andreas Halvorsen. Norwegian Halvorsen launched Viking Global at the end of 1999 with former Tiger Management Fund employees David Ott and Brian Olson. In the second quarter Andreas Halvorsen buys Amazon.com Inc., Seagate Technology, Lyondellbasell Industries Cl A, Goodrich Corp., Humana Inc., Mosaic Company etc. As of 06/30/2011, Viking Global Investors LP owns 59 stocks with a total value of $11.9 billion. These are the details of the buys and sells that have the impact to portfolio of more than .2%.

Viking is a long/short global equity fund with a bottom-up stock picking approach: “We believe that our thoughtful analysis and disciplined valuation over time yield a diversified portfolio of longs and shorts whose stock price developments will deviate from each other and provide a profitable spread.” Viking analysts are encouraged to invest in stock choices they find compelling, regardless of management sentiment: “When we had strong conviction in an investment and scaled it, our success rate increased – in other words, our high conviction has been correlated with improved odds of being right.”

This is the portfolio chart of Andreas Halvorsen. You can click on the legend of the chart to show/hide buys, sells, or holdings. Each ball on the chart represents a position in the portfolio. You can move your mouse on the balls to see the details of each position and click to see the details of all guru trades with this position.

Andreas Halvorsen added to his holdings in Amazon.com Inc. by 388.3%. His purchase prices were between $178.34 and $206.07, with an estimated average price of $191.48. The impact to his portfolio due to this purchase was 2.77%. His holdings were 2,031,800 shares as of 06/30/2011.

Andreas Halvorsen added to his holdings in Lyondellbasell Industries Cl A by 204.26%. His purchase prices were between $36.56 and $44.57, with an estimated average price of $40.57. The impact to his portfolio due to this purchase was 2.55%. His holdings were 11,800,693 shares as of 06/30/2011.

Andreas Halvorsen added to his holdings in Goodrich Corp. by 317.68%. His purchase prices were between $83.59 and $94.63, with an estimated average price of $88.17. The impact to his portfolio due to this purchase was 1.51%. His holdings were 2,478,981 shares as of 06/30/2011.

Andreas Halvorsen added to his holdings in Humana Inc. by 331.77%. His purchase prices were between $69.35 and $82.55, with an estimated average price of $76.66. The impact to his portfolio due to this purchase was 1.43%. His holdings were 2,769,400 shares as of 06/30/2011.

Added: Invesco Ltd. (IVZ)

Andreas Halvorsen added to his holdings in Invesco Ltd. by 24.09%. His purchase prices were between $21.92 and $26, with an estimated average price of $24.15. The impact to his portfolio due to this purchase was 1.16%. His holdings were 30,559,442 shares as of 06/30/2011.

Added: Cardinal Health Inc. (CAH)

Andreas Halvorsen added to his holdings in Cardinal Health Inc. by 159.02%. His purchase prices were between $40.65 and $45.54, with an estimated average price of $43.82. The impact to his portfolio due to this purchase was 1.15%. His holdings were 4,908,377 shares as of 06/30/2011.

Added: News Corp. (NWSA)

Andreas Halvorsen added to his holdings in News Corp. by 36.28%. His purchase prices were between $16.05 and $18.34, with an estimated average price of $17.23. The impact to his portfolio due to this purchase was 1.08%. His holdings were 27,358,266 shares as of 06/30/2011.

Added: Talisman Energy Inc. (TLM)

Andreas Halvorsen added to his holdings in Talisman Energy Inc. by 82.69%. His purchase prices were between $18.69 and $24.78, with an estimated average price of $21.47. The impact to his portfolio due to this purchase was 0.93%. His holdings were 11,979,800 shares as of 06/30/2011.

Added: Time Warner Cable Inc. (TWC)

Andreas Halvorsen added to his holdings in Time Warner Cable Inc. by 17.32%. His purchase prices were between $71.75 and $78.46, with an estimated average price of $75.31. The impact to his portfolio due to this purchase was 0.87%. His holdings were 9,058,812 shares as of 06/30/2011.

Added: H&r Block Inc. (HRB)

Andreas Halvorsen added to his holdings in H&r Block Inc. by 21.1%. His purchase prices were between $15.38 and $17.88, with an estimated average price of $16.54. The impact to his portfolio due to this purchase was 0.47%. His holdings were 20,216,740 shares as of 06/30/2011.

Added: Qualcomm Inc. (QCOM)

Andreas Halvorsen added to his holdings in Qualcomm Inc. by 63.25%. His purchase prices were between $52.25 and $58.59, with an estimated average price of $55.57. The impact to his portfolio due to this purchase was 0.43%. His holdings were 2,309,600 shares as of 06/30/2011.

Added: St. Jude Medical Inc. (STJ)

Andreas Halvorsen added to his holdings in St. Jude Medical Inc. by 49.44%. His purchase prices were between $46.3 and $53.61, with an estimated average price of $50.71. The impact to his portfolio due to this purchase was 0.43%. His holdings were 3,258,300 shares as of 06/30/2011.

Added: U.s. Bancorp (USB)

Andreas Halvorsen added to his holdings in U.s. Bancorp by 25.47%. His purchase prices were between $23.85 and $26.9, with an estimated average price of $25.17. The impact to his portfolio due to this purchase was 0.42%. His holdings were 9,716,600 shares as of 06/30/2011.

Added: Cigna Corp. (CI)

Andreas Halvorsen added to his holdings in Cigna Corp. by 55.53%. His purchase prices were between $43.13 and $51.27, with an estimated average price of $47.48. The impact to his portfolio due to this purchase was 0.42%. His holdings were 2,755,821 shares as of 06/30/2011.

Added: Vanceinfo Technologies Inc. Ads (VIT)

Andreas Halvorsen added to his holdings in Vanceinfo Technologies Inc. Ads by 178.06%. His purchase prices were between $20 and $34.55, with an estimated average price of $27.24. The impact to his portfolio due to this purchase was 0.39%. His holdings were 3,125,700 shares as of 06/30/2011.

Added: Priceline.com Inc. (PCLN)

Andreas Halvorsen added to his holdings in Priceline.com Inc. by 9.13%. His purchase prices were between $458.78 and $555.65, with an estimated average price of $510.49. The impact to his portfolio due to this purchase was 0.35%. His holdings were 989,440 shares as of 06/30/2011.

Added: Aetna Inc. (AET)

Andreas Halvorsen added to his holdings in Aetna Inc. by 58.9%. His purchase prices were between $36.52 and $45.9, with an estimated average price of $41.79. The impact to his portfolio due to this purchase was 0.26%. His holdings were 1,867,100 shares as of 06/30/2011.

Andreas Halvorsen initiated holdings in Seagate Technology. His purchase prices were between $14.25 and $18.22, with an estimated average price of $16.37. The impact to his portfolio due to this purchase was 2.71%. His holdings were 20,036,036 shares as of 06/30/2011.

Andreas Halvorsen initiated holdings in Mosaic Company. His purchase prices were between $59.32 and $82.56, with an estimated average price of $70.32. The impact to his portfolio due to this purchase was 1.41%. His holdings were 2,492,500 shares as of 06/30/2011.

Andreas Halvorsen initiated holdings in Biogen Idec Inc. His purchase prices were between $72.96 and $108.98, with an estimated average price of $93.13. The impact to his portfolio due to this purchase was 1.24%. His holdings were 1,388,966 shares as of 06/30/2011.

Andreas Halvorsen initiated holdings in Morgan Stanley. His purchase prices were between $21.93 and $27.76, with an estimated average price of $24.47. The impact to his portfolio due to this purchase was 1.18%. His holdings were 6,104,957 shares as of 06/30/2011.

Andreas Halvorsen initiated holdings in Allstate Corp.. His purchase prices were between $29.43 and $34.31, with an estimated average price of $31.39. The impact to his portfolio due to this purchase was 1.11%. His holdings were 4,357,900 shares as of 06/30/2011.

Andreas Halvorsen initiated holdings in Schlumberger Ltd.. His purchase prices were between $80.64 and $93.7, with an estimated average price of $85.2. The impact to his portfolio due to this purchase was 1.01%. His holdings were 1,397,600 shares as of 06/30/2011.

Andreas Halvorsen initiated holdings in Marriott International Inc. Cl A. His purchase prices were between $33.12 and $37.86, with an estimated average price of $35.39. The impact to his portfolio due to this purchase was 0.93%. His holdings were 3,139,086 shares as of 06/30/2011.

New Purchase: Agrium Inc. (AGU)

Andreas Halvorsen initiated holdings in Agrium Inc.. His purchase prices were between $79.22 and $95.4, with an estimated average price of $86.05. The impact to his portfolio due to this purchase was 0.87%. His holdings were 1,189,800 shares as of 06/30/2011.

New Purchase: Home Depot Inc. (HD)

Andreas Halvorsen initiated holdings in Home Depot Inc.. His purchase prices were between $33.47 and $38.17, with an estimated average price of $36.39. The impact to his portfolio due to this purchase was 0.78%. His holdings were 2,584,200 shares as of 06/30/2011.

New Purchase: Watson Pharmaceuticals Inc. (WPI)

Andreas Halvorsen initiated holdings in Watson Pharmaceuticals Inc.. His purchase prices were between $56.51 and $68.2, with an estimated average price of $62.2. The impact to his portfolio due to this purchase was 0.62%. His holdings were 1,076,800 shares as of 06/30/2011.

New Purchase: Starwood Hotels & Resorts Worldwide Inc. (HOT)

Andreas Halvorsen initiated holdings in Starwood Hotels & Resorts Worldwide Inc.. His purchase prices were between $51.88 and $60.98, with an estimated average price of $57.27. The impact to his portfolio due to this purchase was 0.59%. His holdings were 1,253,100 shares as of 06/30/2011.

New Purchase: Xilinx Inc. (XLNX)

Andreas Halvorsen initiated holdings in Xilinx Inc.. His purchase prices were between $30.55 and $36.28, with an estimated average price of $33.89. The impact to his portfolio due to this purchase was 0.56%. His holdings were 1,848,700 shares as of 06/30/2011.

New Purchase: Brookfield Office Properties (BPO)

Andreas Halvorsen initiated holdings in Brookfield Office Properties. His purchase prices were between $18.04 and $19.8, with an estimated average price of $18.94. The impact to his portfolio due to this purchase was 0.43%. His holdings were 2,691,900 shares as of 06/30/2011.

New Purchase: Charles River Laboratories International Inc. (CRL)

Andreas Halvorsen initiated holdings in Charles River Laboratories International Inc.. His purchase prices were between $37.38 and $42.3, with an estimated average price of $39.95. The impact to his portfolio due to this purchase was 0.41%. His holdings were 1,217,434 shares as of 06/30/2011.

New Purchase: Hartford Financial Svcs. (HIG)

Andreas Halvorsen initiated holdings in Hartford Financial Svcs.. His purchase prices were between $23.81 and $28.97, with an estimated average price of $26.43. The impact to his portfolio due to this purchase was 0.29%. His holdings were 1,320,200 shares as of 06/30/2011.

New Purchase: American International Group Inc. (AIG)

Andreas Halvorsen initiated holdings in American International Group Inc.. His purchase prices were between $27.23 and $35, with an estimated average price of $30.45. The impact to his portfolio due to this purchase was 0.25%. His holdings were 1,000,000 shares as of 06/30/2011.

Reduced: American Tower Corp. Cl A (AMT)

Andreas Halvorsen reduced to his holdings in American Tower Corp. Cl A by 67.35%. His sale prices were between $49.52 and $55.48, with an estimated average price of $51.9. The impact to his portfolio due to this sale was -2.67%. Andreas Halvorsen still held 2,889,884 shares as of 06/30/2011.

Reduced: Blackrock Inc (BLK)

Andreas Halvorsen reduced to his holdings in Blackrock Inc by 48.25%. His sale prices were between $184.39 and $205.56, with an estimated average price of $193.98. The impact to his portfolio due to this sale was -1.65%. Andreas Halvorsen still held 1,016,100 shares as of 06/30/2011.

Reduced: Johnson Controls Inc. (JCI)

Andreas Halvorsen reduced to his holdings in Johnson Controls Inc. by 38.61%. His sale prices were between $35.81 and $42.08, with an estimated average price of $38.93. The impact to his portfolio due to this sale was -1.64%. Andreas Halvorsen still held 7,288,531 shares as of 06/30/2011.

Reduced: Metlife Inc. (MET)

Andreas Halvorsen reduced to his holdings in Metlife Inc. by 80.61%. His sale prices were between $39.24 and $46.79, with an estimated average price of $43.49. The impact to his portfolio due to this sale was -1.46%. Andreas Halvorsen still held 909,000 shares as of 06/30/2011.

Reduced: Estee Lauder Cos. Inc. (EL)

Andreas Halvorsen reduced to his holdings in Estee Lauder Cos. Inc. by 20.51%. His sale prices were between $93.87 and $105.13, with an estimated average price of $98.14. The impact to his portfolio due to this sale was -1.18%. Andreas Halvorsen still held 5,492,824 shares as of 06/30/2011.

Reduced: Sherwinwilliams Co. (SHW)

Andreas Halvorsen reduced to his holdings in Sherwinwilliams Co. by 27.31%. His sale prices were between $81.32 and $87.84, with an estimated average price of $84.1. The impact to his portfolio due to this sale was -1.09%. Andreas Halvorsen still held 4,012,931 shares as of 06/30/2011.

Reduced: Valeant Pharmaceuticals International Inc. (VRX)

Andreas Halvorsen reduced to his holdings in Valeant Pharmaceuticals International Inc. by 31.28%. His sale prices were between $48.24 and $54.05, with an estimated average price of $51.71. The impact to his portfolio due to this sale was -0.89%. Andreas Halvorsen still held 4,558,703 shares as of 06/30/2011.

Reduced: Check Point Software Technologies Ltd. (CHKP)

Andreas Halvorsen reduced to his holdings in Check Point Software Technologies Ltd. by 34.97%. His sale prices were between $51.35 and $56.09, with an estimated average price of $53.91. The impact to his portfolio due to this sale was -0.41%. Andreas Halvorsen still held 1,743,188 shares as of 06/30/2011.

Reduced: D.r. Horton Inc. (DHI)

Andreas Halvorsen reduced to his holdings in D.r. Horton Inc. by 26.36%. His sale prices were between $10.76 and $12.44, with an estimated average price of $11.6. The impact to his portfolio due to this sale was -0.29%. Andreas Halvorsen still held 8,149,300 shares as of 06/30/2011.

Sold Out: Emc Corp. (EMC)

Andreas Halvorsen sold out his holdings in Emc Corp.. His sale prices were between $25.64 and $28.47, with an estimated average price of $27.16.

Sold Out: Yum! Brands Inc. (YUM)

Andreas Halvorsen sold out his holdings in Yum! Brands Inc.. His sale prices were between $49.58 and $56.69, with an estimated average price of $53.55.

Sold Out: Wells Fargo & Co. (WFC)

Andreas Halvorsen sold out his holdings in Wells Fargo & Co.. His sale prices were between $25.36 and $32.4, with an estimated average price of $28.41.

Sold Out: United Parcel Service, Inc. (UPS)

Andreas Halvorsen sold out his holdings in United Parcel Service, Inc.. His sale prices were between $68.46 and $75.09, with an estimated average price of $72.51.

Sold Out: Devon Energy Corp. (DVN)

Andreas Halvorsen sold out his holdings in Devon Energy Corp.. His sale prices were between $76.02 and $92, with an estimated average price of $83.59.

Sold Out: Exxon Mobil Corp. (XOM)

Andreas Halvorsen sold out his holdings in Exxon Mobil Corp.. His sale prices were between $76.78 and $87.98, with an estimated average price of $82.35.

Sold Out: Lowes Cos. (LOW)

Andreas Halvorsen sold out his holdings in Lowes Cos.. His sale prices were between $22.05 and $27.09, with an estimated average price of $24.89.

Sold Out: Opentable Inc. (OPEN)

Andreas Halvorsen sold out his holdings in Opentable Inc.. His sale prices were between $73.99 and $115.62, with an estimated average price of $92.97.

Sold Out: Acme Packet Inc. (APKT)

Andreas Halvorsen sold out his holdings in Acme Packet Inc.. His sale prices were between $60.52 and $83.73, with an estimated average price of $72.65.

Sold Out: Cemex S.a. De C.v. Ads (CX)

Andreas Halvorsen sold out his holdings in Cemex S.a. De C.v. Ads. His sale prices were between $7.59 and $9.2, with an estimated average price of $8.34.

Sold Out: Mckesson Corp. (MCK)

Andreas Halvorsen sold out his holdings in Mckesson Corp.. His sale prices were between $77.6 and $86.88, with an estimated average price of $82.94.

Sold Out: Aon Corp. (AON)

Andreas Halvorsen sold out his holdings in Aon Corp.. His sale prices were between $49.12 and $53.8, with an estimated average price of $51.76.

Sold Out: Informatica Corp. (INFA)

Andreas Halvorsen sold out his holdings in Informatica Corp.. His sale prices were between $51.2 and $58.66, with an estimated average price of $54.4.

Sold Out: Gafisa S/a Ads (GFA)

Andreas Halvorsen sold out his holdings in Gafisa S/a Ads. His sale prices were between $9.19 and $14.26, with an estimated average price of $11.24.

Sold Out: Western Digital Corp. (WDC)

Andreas Halvorsen sold out his holdings in Western Digital Corp.. His sale prices were between $33.47 and $41.24, with an estimated average price of $36.84.

Sold Out: Hospira Inc. (HSP)

Andreas Halvorsen sold out his holdings in Hospira Inc.. His sale prices were between $53.74 and $58.13, with an estimated average price of $55.51.

Sold Out: Fortinet Inc. (FTNT)

Andreas Halvorsen sold out his holdings in Fortinet Inc.. His sale prices were between $18.94 and $26.91, with an estimated average price of $22.84.

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